If an element has a mass number of 232 and an atomic number of 93, how many neutrons does the element have

Explanation:

It is known that atomic mass is the sum of total number of protons and neutrons present in an element.

And, atomic number is the sum of total number of protons present in an atom.

As it is mentioned that the given element has atomic mass 232 and its atomic number is 93. So, number of neutrons present in it are calculated as follows.

        Atomic mass = no. of protons + no. of neutrons

                 232 = 93 + no. of neutrons

          no. of neutrons = 232 - 93

                                    = 139

Thus, we can conclude that given element has 139 neutrons.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.